package com.admin.common.util;

import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 * @author ZY
 * @date 2020/12/31
 */
public class AESUtil_01 {

    private static final Logger logger = LoggerFactory.getLogger(AESUtil_01.class);

    /**
     * 加密算法
     *
     * @param sSrc
     * @param sKey
     * @return
     * @throws Exception
     */
    public static String Encrypt(String sSrc, String sKey) throws Exception {
        if (sKey == null) {
            logger.error("Key为空null");
            return null;
        }
        // 判断Key是否为16位
        if (sKey.length() != 16) {
            logger.error("Key长度不是16位");
            return null;
        }
        byte[] raw = sKey.getBytes("utf-8");
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// "算法/模式/补码方式"
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

        String result = Base64.getEncoder().encodeToString(encrypted);
        return java.net.URLEncoder.encode(result, "UTF-8"); // 此处使用BASE64做转码功能，同时能起到2次加密的作用。
    }

    /**
     * 解密算法
     * 
     * @param sSrc
     * @param sKey
     * @return
     * @throws Exception
     */
    public static String Decrypt(String sSrc, String sKey) {
        try {
            // 判断Key是否正确
            if (sKey == null) {
                logger.error("Key为空null");
                return null;
            }
            // 判断Key是否为16位
            if (sKey.length() != 16) {
                logger.error("Key长度不是16位");
                return null;
            }
            byte[] raw = sKey.getBytes("utf-8");
            SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");// "算法/模式/补码方式"
            cipher.init(Cipher.DECRYPT_MODE, skeySpec);
            try {
                sSrc = java.net.URLDecoder.decode(sSrc, "UTF-8");
                byte[] encrypted1 = Base64.getDecoder().decode(sSrc);// 先用base64解密
                byte[] original = cipher.doFinal(encrypted1);
                String originalString = new String(original, "utf-8");
                return originalString;
            } catch (Exception e) {
                logger.error("系统异常：", e);
                return null;
            }
        } catch (Exception ex) {
            logger.error("系统异常：", ex);
            return null;
        }
    }

    public static void main(String[] args) throws Exception {
        /*
        * 此处使用AES-128-ECB加密模式，key需要为16位。  */ String cKey = "yingShu_20201231";
        // 需要加密的字串
        String cSrc = "JYeTVtJRUJbDIxRLlRP6R3hmJLhMx0";

        System.out.println(cSrc);
        // 加密
        String enString = AESUtil_01.Encrypt(cSrc, cKey);
        System.out.println("加密后的字串是：" + enString);

        // 解密
        String DeString = AESUtil_01.Decrypt(enString, cKey);
        System.out.println("解密后的字串是：" + DeString);
    }
}